Use the NT System Performance group that provides statistics to track the health and performance of the Windows operating system of a system.
Class: ntSystemPerf
For example, a heavily loaded system typically has a high level of system activity with many process threads competing for CPU time and jobs queuing up as they wait to run. You can track the level of system activity by monitoring the ntContextSwitches and ntRunQLen MIB objects.
ntContextSwitches counts the number of context switches that have occurred. A context switch occurs each time that a thread gives up the CPU and another takes its place. A high rate of context switching indicates a high system load. ntRunQLen indicates whether there is a backup of threads waiting to run.
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